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package main
import (
_ "embed"
"encoding/json"
"fmt"
"log"
"net"
"net/url"
"os"
"regexp"
"strconv"
"time"
)
const (
MQTT_BROKER_REGEX = `^tcp://127\.0\.0\.1:\d+$`
MQTT_CLIENT_ID_REGEX = `^[0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ]{1,23}$`
MQTT_TOPIC_PREFIX_REGEX = `^[a-zA-Z0-9]{1,20}$`
)
var (
mqttBrokerRegexp *regexp.Regexp
mqttClientIDRegexp *regexp.Regexp
mqttTopicPrefixRegexp *regexp.Regexp
)
func init() {
mqttBrokerRegexp = regexp.MustCompile(MQTT_BROKER_REGEX)
mqttClientIDRegexp = regexp.MustCompile(MQTT_CLIENT_ID_REGEX)
mqttTopicPrefixRegexp = regexp.MustCompile(MQTT_TOPIC_PREFIX_REGEX)
}
//go:embed configs/default.json
var defaultConfig []byte
type MQTTConfig struct {
Broker string `json:"broker"`
ClientID string `json:"client-id"`
TopicPrefix string `json:"topic-prefix"`
}
type HomematicConfig struct {
CCU string `json:"ccu"`
PollingPeriod string `json:"polling-period"`
}
type StartupConfig struct {
MQTT MQTTConfig `json:"mqtt"`
Homematic HomematicConfig `json:"homematic"`
}
func (sc StartupConfig) String() string {
prefix := ""
indent := "\t"
data, err := json.MarshalIndent(sc, prefix, indent)
if err != nil {
log.Println("Failed to marshal startup configuration.")
return ""
}
return string(data)
}
func (sc StartupConfig) Validate() error {
if !mqttBrokerRegexp.MatchString(sc.MQTT.Broker) {
return fmt.Errorf(
"mqtt/broker configuration '%s' does not match regular expression '%s'.",
sc.MQTT.Broker,
MQTT_BROKER_REGEX,
)
}
if !mqttClientIDRegexp.MatchString(sc.MQTT.ClientID) {
return fmt.Errorf(
"mqtt/client-id configuration '%s' does not match regular expression '%s'.",
sc.MQTT.ClientID,
MQTT_CLIENT_ID_REGEX,
)
}
if !mqttTopicPrefixRegexp.MatchString(sc.MQTT.TopicPrefix) {
return fmt.Errorf(
"mqtt/topic-prefix configuration '%s' does not match regular expression '%s'.",
sc.MQTT.TopicPrefix,
MQTT_TOPIC_PREFIX_REGEX,
)
}
cu, err := url.Parse(sc.Homematic.CCU)
if err != nil {
return fmt.Errorf("homematic/ccu configuration '%s' cannot be parsed as URL: %v", sc.Homematic.CCU, err)
}
if cu.Scheme != `http` {
return fmt.Errorf("homematic/ccu configuration '%s' must use scheme 'http'.", sc.Homematic.CCU)
}
host, portstring, err := net.SplitHostPort(cu.Host)
if err != nil {
return fmt.Errorf("homematic/ccu configuration '%s' can't be split into hostname and port: %v", sc.Homematic.CCU, err)
}
ip := net.ParseIP(host)
if ip == nil {
return fmt.Errorf("homematic/ccu configuration '%s' must use a plain IP address as host.", sc.Homematic.CCU)
}
_, err = strconv.Atoi(portstring)
if err != nil {
return fmt.Errorf("homematic/ccu configuration '%s' must use a numeric port: %v", sc.Homematic.CCU, err)
}
_, err = time.ParseDuration(sc.Homematic.PollingPeriod)
if err != nil {
return fmt.Errorf("homematic/polling-period configuration '%s' could not be parsed to duration: %v", sc.Homematic.PollingPeriod, err)
}
return nil
}
func (sc *StartupConfig) FromJSON(data []byte) error {
err := json.Unmarshal(data, sc)
if err != nil {
return fmt.Errorf("Failed to unmarshal configuration: %w", err)
}
err = sc.Validate()
if err != nil {
return fmt.Errorf("Could not validate configuration: %w", err)
}
return nil
}
func (sc *StartupConfig) FromFile(path string) error {
data, err := os.ReadFile(path)
if err != nil {
return fmt.Errorf("Failed to read config file '%s': %w", path, err)
}
err = sc.FromJSON(data)
if err != nil {
return fmt.Errorf("Could not parse config file '%s': %w", path, err)
}
return nil
}
func GetStartupConfig(path string) StartupConfig {
config := StartupConfig{}
err := config.FromJSON(defaultConfig)
if err != nil {
log.Fatalf("Could not parse default config: %v", err)
}
if path != "" {
log.Printf("Config path: %s", path)
err = config.FromFile(path)
if err != nil {
log.Fatalf("Failed to read configuration: %v", err)
}
}
log.Printf("Startup configuration:\n%v", config)
return config
}
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